US4029868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrafluoroethylene terpolymers
Assignee: EIDP Inc
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Filing: 1976-03-10
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Granted: 1977-06-14
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Expires: 1996-03-10
Abstract
Abstract Terpolymers of tetrafluoroethylene, hexafluoropropylene and either perfluoro(propyl vinyl ether) or perfluoro(ethyl vinyl ether) are described which are prepared by polymerizing the monomers in the presence of a chlorofluoroalkane or chlorofluorohydroalkane solvent and a chain transfer agent and an initiator in either an aqueous or nonaqueous medium. The terpolymers are useful as films, fibers or tubes.
Inventors
- 👤 Dana Peter Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:15
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A solid, substantially nonelastomeric terpolymer consisting of, in copolymerized form, a. tetrafluoroethylene, b. between about 4 and about 12 weight percent hexafluoropropylene, and c. between about 0.5 and about 3 weight percent of either perfluoro(ethyl vinyl ether) or perfluoro(n-propyl vinyl ether), said weight percent being based on weight of terpolymer, wherein the terpolymer has a melt viscosity of between about 10 3 and 10 7 poise at 372° C.
Claim 2
Dependent Claim
69 words
A solid, substantially nonelastomeric terpolymer consisting of, in copolymerized form, a. tetrafluoroethylene, b. between about 4 and about 12 weight percent hexafluoropropylene, and c. between about 0.5 and about 3 weight percent of either perfluoro(ethyl vinyl ether) or perfluoro(n-propyl vinyl ether), said weight percent being based on weight of terpolymer, wherein the terpolymer has a melt viscosity of between about 10 3 and 10 7 poise at 372° C.
Claim 3
Dependent Claim
12 words
The terpolymer of claim 1 wherein monomer (c) is perfluoro(propyl vinyl ether).
Claim 4
Dependent Claim
37 words
The terpolymer of claim 2 wherein monomer (b) is present in an amount of between about 5 and 8 weight percent and monomer (c) is present in an amount of between about 0.75 and 2.0 weight percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |